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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package org.scijava.welcome;

import java.io.File;
import java.io.IOException;

import org.scijava.app.AppService;
import org.scijava.command.CommandService;
import org.scijava.display.DisplayService;
import org.scijava.event.EventHandler;
import org.scijava.event.EventService;
import org.scijava.log.LogService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.prefs.PrefService;
import org.scijava.service.AbstractService;
import org.scijava.service.Service;
import org.scijava.text.TextService;
import org.scijava.ui.event.UIShownEvent;
import org.scijava.util.DigestUtils;
import org.scijava.welcome.event.WelcomeEvent;

/**
 * Default service for displaying the welcome greeting.
 * 
 * @author Curtis Rueden
 * @author Mark Hiner
 */
@Plugin(type = Service.class)
public class DefaultWelcomeService extends AbstractService implements
	WelcomeService
{

	private final static String WELCOME_FILE = "WELCOME.md";
	private final static String CHECKSUM_PREFS_KEY = "checksum";

	@Parameter
	private LogService log;

	@Parameter
	private AppService appService;

	@Parameter
	private DisplayService displayService;

	@Parameter
	private CommandService commandService;

	@Parameter
	private TextService textService;

	@Parameter
	private EventService eventService;

	@Parameter
	private PrefService prefService;

	// -- ReadmeService methods --

	@Override
	public void displayWelcome() {
		displayWelcome(true);
	}

	private void displayWelcome(final boolean force) {
		final File baseDir = appService.getApp().getBaseDirectory();
		final File welcomeFile = new File(baseDir, WELCOME_FILE);
		try {
			if (welcomeFile.exists()) {
				final String welcomeText = textService.asHTML(welcomeFile);
				final String checksum = DigestUtils.bestHex(welcomeText);
				final String previousChecksum = prefService.get(getClass(), CHECKSUM_PREFS_KEY);
				if (!force && checksum.equals(previousChecksum)) return;
				prefService.put(getClass(), CHECKSUM_PREFS_KEY, checksum);
				displayService.createDisplay(welcomeText);
			}
		}
		catch (final IOException e) {
			throw new IllegalStateException(e.getMessage());
		}
	}

	@Override
	public boolean isFirstRun() {
		final String firstRun = prefService.get(getClass(), firstRunPrefKey());
		return firstRun == null || Boolean.parseBoolean(firstRun);
	}

	@Override
	public void setFirstRun(final boolean firstRun) {
		prefService.put(getClass(), firstRunPrefKey(), firstRun);
	}

	// -- Event handlers --

	/** Displays the welcome text when a UI is shown for the first time. */
	@EventHandler
	protected void onEvent(@SuppressWarnings("unused") final UIShownEvent evt) {
		if (!isFirstRun()) return;
		eventService.publish(new WelcomeEvent());
		setFirstRun(false);
		displayWelcome(false);
	}

	// -- Helper methods --

	/** Gets the preference key for the SciJava application's first run. */
	private String firstRunPrefKey() {
		return "firstRun-" + appService.getApp().getVersion();
	}

}